AN2815 datasheet(18/42 Pages) STMICROELECTRONICS

18 / 42 page

Getting started

AN2815

18/42

Getting started

The following step-by-step power-up and power-down sequences are provided in order to

correctly evaluate the PM6675AS demonstration board performance.

●

Power-up sequence

–

Working in an ESD-protected environment is highly recommended. Check all wrist

straps and ground mat connections before handling the PM6675AS demonstration

board

–

Connect power supplies as shown in the PM6675AS demonstration board test

setup (Figure 12) and insert the meters in order to perform the desired

performance evaluation. Connect the scope-probes as desired

–

Set the JP1 through JP5 jumpers in order to properly configure the PM6675AS

board (default position suggested). Set the SWEN-LEN switches to the on position

(upper position); Do not change jumper settings when the board is powered

–

Set the VCC supply to 5 V±5% and the current limit to 100 mA

–Set the VIN supply to a voltage in the range 4.5 V to 36 V. An initial test at 24 V and

2 A current limit is suggested

–

Set all the loads to 0 A

–

Turn-on the VIN supply

–

Turn-on the VCC supply

–Vary the VOUT load from 0 A to 8 A

–Vary the LOUT load from 0 A to 2 A to test source capability. If a different LDO input

is desired, connect the external rail as dashed in Figure 12 and remove the R6

resistor. All changes must be done when the board is not powered

–

Vary VIN supply from 4.5 V to 36 V

●

Power-down sequence

–

Decrease LOUT loads to 0 A

–

Reduce VOUT load to 0 A

–

Decrease VCC supply from 5 V to 3.8 V in order to test the UVLO

–

Increase VCC supply from 3.8 V to 5 V to restart the device

–

Use the SWEN-LEN switches to test soft-start and soft-end on both outputs

–

Turn-off the VOUT load

–

Turn-off the VCC supply

–

Turn-off the VIN supply

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